Hi Sandeep,
For the sake of keeping it simple we have been adding 1 lot of Nifty everytime to the position but if you want the ideal way for adding would as follows
calculate the risk amount you want to put like suppose 1% of total amount in your potfolio
calculate the first stop risk, suppose its 100 pts. away and you 1% risk money is 10000, so you buy 2 lots
Next time new pivot is formed you calculate how much risk remains on your initial entry + risk on you current add, suppose new pivot is 20 pts. away from your entry price and 80 from add point so again calculate 1% i.e 10000/100 = 100. So you can add 2 lots again so on & forth